Which gas is the main component of the atmosphere of Mars?

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Multiple Choice

Which gas is the main component of the atmosphere of Mars?

Explanation:
The main idea is how a planet’s atmosphere ends up being dominated by a particular gas. Mars has relatively weak gravity and only a thin atmosphere, so light gases readily escape to space. Carbon dioxide stays as the dominant gas because it is continuously sourced from the planet’s crust and ice caps, and it remains stable under Mars’ cold conditions. Over time, hydrogen and other light gases escape away, and oxygen and nitrogen exist only in much smaller amounts. That combination leaves carbon dioxide as the overwhelming majority of the Martian atmosphere today.

The main idea is how a planet’s atmosphere ends up being dominated by a particular gas. Mars has relatively weak gravity and only a thin atmosphere, so light gases readily escape to space. Carbon dioxide stays as the dominant gas because it is continuously sourced from the planet’s crust and ice caps, and it remains stable under Mars’ cold conditions. Over time, hydrogen and other light gases escape away, and oxygen and nitrogen exist only in much smaller amounts. That combination leaves carbon dioxide as the overwhelming majority of the Martian atmosphere today.

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